If you have some doubts about network quality of your connections then you can check Speed/Quality/Connection Status over your SAP system easily…
Just go to the transaction OSS1 and follow the screens shown below..

Select the system you want to check and click the “10 X Ping” button

You can get the result like below and if you want to get detail info then press the DETAIL button

You will get the detail information like below , this is an example of SUCCESS connection.

If there is a connection problem then you may get the detail info like this